Platform



FIG. 1 is a perspective view of a platform in accordance with the new design;

FIG. 2 is a top view thereof; and,

FIG. 3 is a front and left side elevational view thereof, a rear and a right side elevational view being a mirror image thereof.

The broken lines in FIGS. 1 and 2 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for the platform, as shown and described. 